Basic Heat Exchanger Performance Evaluation Method on OTEC
Ocean thermal energy conversion (OTEC) harvests the power from the thermal energy in the ocean, which is reserved in the ocean as the temperature difference between warm surface and cold deep seawaters. In the energy conversion, the heat exchangers transfer the thermal energy to the heat engine, whi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-04-01
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| Series: | Journal of Marine Science and Engineering |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2077-1312/6/2/32 |
| _version_ | 1819062284067012608 |
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| author | Takeshi Yasunaga Takafumi Noguchi Takafumi Morisaki Yasuyuki Ikegami |
| author_facet | Takeshi Yasunaga Takafumi Noguchi Takafumi Morisaki Yasuyuki Ikegami |
| author_sort | Takeshi Yasunaga |
| collection | DOAJ |
| description | Ocean thermal energy conversion (OTEC) harvests the power from the thermal energy in the ocean, which is reserved in the ocean as the temperature difference between warm surface and cold deep seawaters. In the energy conversion, the heat exchangers transfer the thermal energy to the heat engine, which converts it into power. The pressure drops yielded by piping, valve and heat exchangers cause pump loads, which show significant negative power with respect to net power in OTEC. The heat transfer performance and the pressure drop in heat exchanger depend on the types and shapes of each heat transfer area. Generally, heat exchangers with higher friction factors yield higher heat transfer performance and vice versa. However, heat transfer performance and pressure drop are separately evaluated and there is no comprehensive performance evaluation index for OTEC power take-off. Therefore, this research proposes a new simplified overall performance evaluation method for heat exchangers, which can be comprehensively and easily applied and takes into consideration the heat transfer performance and the pressure drop. The evaluation results on plate-type heat exchangers show that the overall performance in each heat exchanger are elucidated and are quantitatively compared. |
| first_indexed | 2024-12-21T14:56:20Z |
| format | Article |
| id | doaj.art-c71dd43da67b4b4ebf65b8bf3c4246be |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-12-21T14:56:20Z |
| publishDate | 2018-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-c71dd43da67b4b4ebf65b8bf3c4246be2022-12-21T18:59:44ZengMDPI AGJournal of Marine Science and Engineering2077-13122018-04-01623210.3390/jmse6020032jmse6020032Basic Heat Exchanger Performance Evaluation Method on OTECTakeshi Yasunaga0Takafumi Noguchi1Takafumi Morisaki2Yasuyuki Ikegami3Institute of Ocean Energy, Saga University, 1 Honjo-machi, Saga 840-8502, JapanGraduate School of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, JapanInstitute of Ocean Energy, Saga University, 1 Honjo-machi, Saga 840-8502, JapanInstitute of Ocean Energy, Saga University, 1 Honjo-machi, Saga 840-8502, JapanOcean thermal energy conversion (OTEC) harvests the power from the thermal energy in the ocean, which is reserved in the ocean as the temperature difference between warm surface and cold deep seawaters. In the energy conversion, the heat exchangers transfer the thermal energy to the heat engine, which converts it into power. The pressure drops yielded by piping, valve and heat exchangers cause pump loads, which show significant negative power with respect to net power in OTEC. The heat transfer performance and the pressure drop in heat exchanger depend on the types and shapes of each heat transfer area. Generally, heat exchangers with higher friction factors yield higher heat transfer performance and vice versa. However, heat transfer performance and pressure drop are separately evaluated and there is no comprehensive performance evaluation index for OTEC power take-off. Therefore, this research proposes a new simplified overall performance evaluation method for heat exchangers, which can be comprehensively and easily applied and takes into consideration the heat transfer performance and the pressure drop. The evaluation results on plate-type heat exchangers show that the overall performance in each heat exchanger are elucidated and are quantitatively compared.http://www.mdpi.com/2077-1312/6/2/32ocean thermal energyOTECheat exchanger performancemaximum power outputback work ratiofinite-time thermodynamics |
| spellingShingle | Takeshi Yasunaga Takafumi Noguchi Takafumi Morisaki Yasuyuki Ikegami Basic Heat Exchanger Performance Evaluation Method on OTEC Journal of Marine Science and Engineering ocean thermal energy OTEC heat exchanger performance maximum power output back work ratio finite-time thermodynamics |
| title | Basic Heat Exchanger Performance Evaluation Method on OTEC |
| title_full | Basic Heat Exchanger Performance Evaluation Method on OTEC |
| title_fullStr | Basic Heat Exchanger Performance Evaluation Method on OTEC |
| title_full_unstemmed | Basic Heat Exchanger Performance Evaluation Method on OTEC |
| title_short | Basic Heat Exchanger Performance Evaluation Method on OTEC |
| title_sort | basic heat exchanger performance evaluation method on otec |
| topic | ocean thermal energy OTEC heat exchanger performance maximum power output back work ratio finite-time thermodynamics |
| url | http://www.mdpi.com/2077-1312/6/2/32 |
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